Compound engine.



R. JUNG.

COMPOUND ENGINE.

APPLIGATION FILED rma. 24, 1912. 1

Batented Nov.12,19125.I

3 SHEETS-SHEET 3 i Eig,

ROEEET JUNG, 0E osNABEoK, GERMANY.

ooMPoUNn ENGINE.

Speeication of Letters Patent. i

Patented Novia, 191e.

'Application led February 24, 1912. Serial No. 679,672.

To au whom t may concern.' j

Be it known4 that I, ROBERT JUNG, a subject of the German Emperor, and resident oi' Osnabrck, Germany, have invented certain new and useful Improvements in Double-Acting TandemCom ound Engines with Stage-Piston, of which t e following isV a specification.

The invention is shown in the accompanying drawing, in which: A y l Figure 1 is a horizontal section of the engine. .Figr 2 is a partial side view of the engine. Fig. 3`is a section o n line A-B ci' Fig. 1.' Fig. 4 is a partial section on` linel vC-D of Fig. l. Fig. 5 is a partial cross section of the engine on line E-F of Fig. 1.

1n this compound engine two single acting high pressure cylinders 1 and 2, the pistons oi' which 3 and 4 and a double acting low pressure cylinder .5. are provided, a double acting piston 6 working in said cylinder 5. The lcylinders are arrangedas in a tandem engine, the low pressure cylinder 5 being directly interposed between both high pressure cylinders. The high pressure cylinder 1 and the low pressure cylinder 5 are 4made integral with eachother and the high' pressure cylinder 2 is connected with the lo-w pressure cylinder. and 6 are connected so as to form a staged piston in which .the pistons 3 and 4 are the end portions and the piston'6 .the middle portion. e.

At the free ends of the high pressure cyl# inders 1 and 2 are provided covers 7 8, steam jackets 9 and 10 being -mountedby any known means on said covers (Figs. 1 and 3). The stage piston rod penetrates one of the covers 7 through a stuiiing box 50. On the covers 7 and 8, are mounted the inlet mea-ns for the live steam, which are shown as pisi ton valves 13, 14. Said piston valves are arranged to move in a tubeshaped housing -15 (Figs. 2 and .3) having ducts 16, 17, which 'ducts 16, 17 open into the high pressure cylinders 1 and 2. The live steam is conveyed to the enginethrough connecting branches 18, 19 which open. 1nto the corresponding steam jackets .9 and 10 of the covers.4 Into the ducts 16 and 17 are also projectingl the tube shaped housings 20 of the auxiliary outlet valves 21, 22.

The steam jacket 23 of the low pressure cylinder 5 serves as a receiver. Ports 26, 27, are provided at the end portions of the high pressure cylinders 1 and 2. The steam The pistons 3, 4

let valves 30 and 31 of jacket 23 extends lover the inner ends of the high pressure cylinders 1 and 2 to such an extent, that theports 26 and 2T open directinto the receiver 23. The receiver 23 is connected with the auxiliary outlet valves 21 and22 by means of short ducts 28, 29 through the steam 'ackets 9 and 10.

Between the walls 24 and 25 4of, the low' pressure cylinder and the end walls of the receiver 23 are provided the inlet means 30,

A31 and the auxiliaryoutlet means 32 and 33.

Said means respectively are also formed by piston valves and disposed in such a manner that the valv"housings 434 and 35 are connected with the interior of the low pressure cylinder 5 by means of corresponding common ducts 36, 37. The free end-of the housing 34 opens into the receiver 23 while the housing 35 is connected through an opening 38 and branches 39 and4() with the condenser or exhaustpiping (Fig. 1).

Outlet ports 41 are provided in the intermediate part of the cylinder 5, said ports opening in an exhaust duct connected 'with an exhaust pipe 42 (Fig. .5).

The inlet means 13 'and 14 of the highl pressure cylinders 1 and 2 are controlled by the connecting rod. 43, the auxiliary outlet valves 21 and 22 of. the high 'pressure cyl inder and the auxiliary valves 32 and 33 of the low pressure cylinder 5 being controlled by means of a connecting'l rod 44 and the int e low pressure cylinder being controlled by means of a rod 45 Aconnected with the connecting rod 44.

The working of the compound-engine yis as follows When the pistons 3, 6 and 4 are at i the left (see Fig. 1) vthe live steam enters through the tube 18 into the steam jacket 9 of" the cover (Fig. 3') and through the slide `valve 13 andthe duct 16 into-the high pressure cylinder 1. Just before the pistons reach the right hand position, the high pressure piston 3 uncovers the outlet iports 26,

so that the greatest part of the steanrflows into the receiver 23. When the pistons'inve back the steam in the cylinder 1 is expelled through the duct 16, the sliding valve 21 and the tube28 and -is'forced into the receimer 23' until the compression, controlled by the sliding valve 21, begins in said cylinder.

This steam, expelled .in alternate manner is heatedwhen it passes the steam jacket 9. At the end of'the `piston stroke 4the exhaust steam ofthe high 4pressure cylinder 2,-' which l enters at the end of the receiver through the ports 27, is joining lthe foregoing steam. This exhaust steam contacts the end 25, of the low pressure cylinder 5, then the peripherical surfaceof said cylinder and after having struck the opposed end 24 it flows together, with the exhaust steam of the second high pressure cylinder, through the sliding valve and the duct 36 to the low pressure cylinder 5 (Fig. 4).

Most of the exhaust steam flows through the exhaust ports 41, uncovered by the low pressure piston G, into `the outlet piping 42. The steam which does not flow through the outlet ports 41 is directed through the duct 36 and thro-ugh the outlet sliding valve 32, which` serves as regulating means for.tlie compression in the low pressure cylinder 5. The live steam entering the high pressure cylinder 2 through the piping 19,` the sliding valve 14 and the duct 17, flows through the engine in the same manner as the live steam entering. they high pressure cylinder 1, but in an opposite directlon, and, after havingflowed around the low pressure cylinder .and 2, isvery small in the above compound 5, it unites with the exhaust steam from the hlgh pressure cyhnder 1. rl`he exhaust steam from the high pressure cylinder 2, enters the yreceiver 28 through the duct 29, during the back stroke of the piston 4. During the following forward stroke of the piston 4 it flows through the inlet valve 31 into the low pressure cylinder 5 and leaves-the engine through thefports 41 and the piping 42.

The condensation of the live steam, while entering', in Vthe high pressure cylindersl engine. The condensation in the low pressure cylinder 5 is also very small, because said cylinder is heated all around by means of moving steam, the steam from the outlet pcrts controlled b vthe high pressure pisl y tons 3 'and 4 being made to {'low in alternate -'currents along the ends and t'he peripherical surface of the low pressure cylinder.

The losses of heat while the steam is passing from the high pressure cylinders 1 and 2 into the low pressure cylinder 5 are very low, because the large part of the exhaust steam of the high pressure cylinder passes directly into the receiver 23.

Having now fully described my said invention, what I claim and desire to secure by Letters Patent, is:`

1.4 A compound steam engine comprising a low pressure cylinder and high pressure cylinders connected with the ends thereof, said cylinders being arranged in tandem, the high pressure cylinders having in the vicinity of their inner ends outlet ports and the low pressure cylinderl being provided approximatelykmidway between its ends with outlet ports,`a jacket surrounding the low pressure cylinder and overlapping the inner ends of the high pressure cylinders and inclosing the outlet ports of the last mentioned cylinders, connected pistons arranged for snnultaneous movement in the cylinders, means for admitting steam into the outer ends of the high pressure cylinders, means for permitting steam to flow from the jacket into the ends of the low pressure cylinder and means for partially exhausting steam from the jacket.

2. A compound steam engine comprising a low pressure cylinder and high pressure cylinders connected with its ends, said cylinders being arranged in tandem, outlet ports located in the vicinity of the inner ends of the high pressure cylinders, said low pressure cylinder being provided with ports located between its'ends, hollow covers closing the outer ends of the high pressure cylin ders, taneous movement in the cylinders, a jacket surrcumling the low pressure cylinder and overlapping the inner ends of the high pressure cylinders and inclosing the outlet ports thereof, means for admitting steam from the covers into the outer ends of theJ high pressure cylinders, ducts connecting the jacket with the covers, means for admitting steam from the jacket kto the ends of the low pressure cylinder and means for partially exhausting the steam from the jacket.

In testimony whereof' I have hereunto set my hand in presence of two witnesses.

ROBERT JUNG.

Witnesses:

Grtsrav TnmaL, ERICH SCI-manen. 

